28. 船舶在艉旗桿升起的是何種旗？ (A) 港口國國旗 (B) 船籍國國旗 (C) 檢疫旗 (D) 領港旗

4. Choose one of the following sentences for expressing ”Engine on half power ahead - steer 182 degr. port side.” (A) “Half ahead - port - steer one eight two.” (B) “Half power ahead - port - steer one eight two.” (C) “Half ahead - port -steer one hundred eighty-two degrees.” (D) “Half speed ahead - port - steer one hundred eighty-two degrees.”